Datasheet AV9120M-47, ICS9120M-47 Datasheet (ICST)

Integrated
Circuit
Systems, Inc.

General Description

Features

ICS9120-47

Modem and Audio Clock Generator

9120-47 Rev B 071696

Block Diagram

The ICS9120-47 is a high performance frequency generator
designed to support digital compact disk drive systems. It
offers all clock frequencies required for the servo and decoder
sections of these devices. These frequencies are synthesized
from a single 16.9344 MHz on-chip oscillator.

High accuracy, low jitter PLLs meet the 150 ppm frequency
tolerance required by these systems. Fast output clock edge
rates minimize board induced jitter.

Unlike competitive devices, the ICS9120-47 operates over
the entire 3.0-5.5V range.

• Generates the output clock frequencies required by
CD-ROM dri ve systems

• Single 16.9344 MHz crystal or system clock reference

• 100ps one sigma jitter

• Output rise/fall times less than 2.0ns (at 5V VDD)

• On-chip loop filter components

• 3.0V-5.5V supply range

• 150 ppm output frequency accuracy

• 8-pin, 150-mil SOIC

Applications

• Specifically designed to support CD-ROM drive
requirements of multimedia applications

2

ICS9120-47

Pin Configuration

Pin Descriptions for ICS9120-47

8-Pin SOIC

External Components/Crystal Selection

The ICS9120-47 incorporates a crystal oscillator circuit de-signed
to provide 50% duty cycle over a range of operating conditions,
including the addition of external crystal load ca-pacitors to pins
X1 and X2.

For the crystal oscillator, the crystal load capacitance must be
connected externally by adding a capacitor from each of the X1
and X2 pins to ground. A parallel resonant 16.9344 MHz crystal is
recommended.

Duty cycle is also maintained when using an external clock source
(connected to X1, X2 left unconnected) as long as the external
clock has good duty cycle.

PIN

NUMBER

PIN NAME TYPE DESCRIPTION

1 X1 Input Crystal or external clock source. Has feedback bias for crystal.

Nominally 16.9344 MHz input applied. (No internal load cap; must

connect external load cap to ground for crystal oscillator).
2 VDD Power +Power supply input.
3 GND Po wer Ground ret urn for Pin 2.
4 CLK3 Output 33.8688 MHz target output clock (with nominal 16.9344 MHz input).
5 CLK2 Output 22.5792 MHz target output clock (with nominal 16.9344 MHz input).
6 CLK4 Output 50.8032 MHz target output clock (with nominal 16.9344 MHz input).
7 REFCLK Output 16.9344 MHz reference clock buffered output (with nominal 16.9344

MHz input).
8 X2 Output Crystal output drive (leave this pin unconnected when using an

external clock). (No internal load cap; must connect external load cap

to ground for crystal oscillator).

3

ICS9120-47

Absolute Maximum Ratings

Electrical Characteristics at 5 V

VDD = +4.5 to +5.5 V, TA = 0 to 70oC unless otherwise stated

*Parameter is guaranteed by design and characterization. Not 100% tested in production.

A VDD, VDD referenced to GND .......................................................................... 7V

Operating temperature under bias .................................................... 0oC to +70oC

Storage temperature..................................................................... -65oC to +150oC

Voltage on I/O pins referenced to GND ...................... GND -0.5V to V DD +0. 5V

Power dissipation...................................................................................... 0.5 Watts

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above those indicated in the operational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect product reliability.

DC Characteristics

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Input Low Voltage V

IL

- - 0.8V

Input High Voltage V

IH

2.0 - - V

Input Low Current I

IL

VIN=0V -18.0 -8.3 - µA

Input High Current I

IH

VIN=V

DD

- - 5.0 µA

Output Low Voltage V

OL

* IOL=+10mA - 0.15 0.4 V

Output High Voltage V

OH

* IOH=-30mA 2.4 3.7 - V

Output Low Current I

OL

*V

OL

=0.8V 25.0 45.0 - mA

Output High Current I

OH

*V

OH

=2.4V - -53.0 -35.0 mA
Supply Current IDD* Unloaded - 30.0 70.0 mA
Pull-up Resistor Value Rpu* - 400.0 800.0 k ohm

AC Characteristics

Rise Time Tr* 15pF load 0.8 to 2.0V - 0.8 2.0 ns
Fall Time T

f

* 15pF load 2.0 to 0.8V - 0.6 1.5 ns

Rise Time T

r

* 15pF load 20% to 80% - 1.7 2.5 ns

Fall Time T

f

* 15pF load 80% to 20% - 1.1 2.0 ns

Duty Cycle D

t

*

15pF load @ 50% of
VDD; Except REFCLK

45.0 50.0 55.0 %

Duty Cycle D

t

*

15pF load @ 50% of
VDD; REFCLK only

40.0 55.0 60.0 %

Jitter, One Sigma T

jis

*

For all frequencies except
REFCLK

- 100.0 140.0 ps

Jitter, Absolute T

jab

*

For all frequencies
except REFCLK

-400.0 250.0 400.0 ps

Jitter, One Sigma T

jis

* REFCLK only - 150.0 150.0 ps

Jitter Absolute T

jab

* REFCLK only -700.0 400.0 700.0 ns

Input Frequency Range F

i

* 11.0 14.0 17.0 MHz
Output Frequency Range Fo* 14.0 - 52.0 MHz
Power-up Time T

pu

* 0 to 40.3 MHz - 5.5 12.0 ms

Crystal Input Capacitance C

inx

*

X1 (Pin 1),
X2 (Pin 8)

-5-pF

4

ICS9120-47

Electrical Characteristics at 3.3 V

VDD = +3.0 to +3.7 V, TA = 0OC-70oC unless otherwise stated

*Parameter is guaranteed by design and characterization. Not 100% tested in production.

DC Characteristics

PARAMETER SYMBOL TEST CONDITI ONS MIN TYP MAX UNITS
Input Low Voltage V

IL

- - 0.2V

DD

V

Input High Voltage V

IH

0.7V

DD

- - V

Input Low Current I

IL

VIN=0V -8.0 -3.6 - µ A

Input High Current I

IH

VIN=VDD - - 5.0 µ A

Output Low Voltage V

OL

*I

OL

=6.0mA - 0.05V

DD

0.1 V

Output High Voltage V

OH

*I

OH

=4.0mA 0.85V

DD

0.94V

DD

-V

Output Low Current I

OL

*V

O

L=0.2V

DD

15.0 24.0 - mA

Output High Current I

OH

*V

OH

=0.7 V

DD

- -13.0 -8.0 mA

Supply Current I

DD

* Unloaded - 20.0 45.0 mA

AC Characteristics

Rise Time Tr* 15pF load 0.8 to 2.0V - 2.2 3.5 ns
Fall Time T

f

* 15pF load 2.0 to 0.8V - 1.2 2.0 ns
Rise Time T

r

* 15pF load 20% to 80% - 2.5 3.5 ns
Fall Time T

f

* 15pF load 80% to 20% - 1.4 2.5 ns
Duty Cycl e D

t

*

15pF load @ 50% of
VDD; Excep t REFCLK

45.0 50.0 55.0 %

Duty Cycl e D

t

*

15pF load @ 50% of
VDD; REFCLK onl y

45.0 57.0 65.0 %

Jitter, One Sigma T

jis

*

For all frequencies
except REFCLK

- 150.0 200 ps

Jitter Absolute T

jab

*

For all frequencies
except REFCLK

-500.0 300.0 500.0 ps

Jitter, One Sigma T

jis

* REFCLK only - 170.0 250.0 ps

Jitter, Absolute T

jab

* REFCLK only -500.0 350.0 500.0 ns

Input Frequency Range F

i

* 11.0 14.3 15.0 MHz
Output Frequency Range F

o

* 14.0 - 52.0 MHz

Power-up Time T

pu*

0 to 40.3 MHz - 5.5 12.0 ms

Crystal Input Capacitance C

inx*

X1 (Pin 1),
X2 (Pin 8)

-5-pF

5

ICS9120-47

Ordering Information

ICS9120M-47

0.194

0.031

0.024

0.016

0.050

0.006 
± 0.004

0.238

0.154

0.015

0.063

0.025

0.008

8-Pin SOIC Package

Example:


ICS XXXX M-PPP

Package Type

M =SOIC

Device Type (consists of 3 or 4-digit numbers)

Prefix



ICS, AV=Standard Device

Pattern Number (2 or 3-digit number for parts with ROM code pattern)